What is the Difference? Please help

Hi I am thinking of getting Easter eggers! Now I am here thinking that EE's and Americana's and Araucanana's are all the same are they? What is the difference between EE's, Americana's and Araucanana's?????

There is a difference...Auracana's are rumpless, EE's are a mixed breed (easter eggers) that can lay blue/green eggs and Ameraucana's are a pure breed that lay blue eggs. This is what I have learned so far...I'm sure someone will have more info for you though!